51122340 has 144 divisors (see below), whose sum is σ = 164254272. Its totient is φ = 13343616.

The previous prime is 51122333. The next prime is 51122341. The reversal of 51122340 is 4322115.

It is a super-2 number, since 2×51122340² = 5226987294151200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51122341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 325542 + ... + 325698.

Almost surely, 2^51122340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51122340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82127136).

51122340 is an abundant number, since it is smaller than the sum of its proper divisors (113131932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51122340 is a wasteful number, since it uses less digits than its factorization.

51122340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51122340 is about 7149.9888111801. The cubic root of 51122340 is about 371.1392690881.

Adding to 51122340 its reverse (4322115), we get a palindrome (55444455).

The spelling of 51122340 in words is "fifty-one million, one hundred twenty-two thousand, three hundred forty".